KOSPI Plunges 5.72% in 'Black Friday' Rout as Foreign Investors Dump 5.7T KRW; Korean Banks Post Record H1 Profit

The Quick Take

• KOSPI fell 5.72% and KOSDAQ dropped more than 5% on July 24 in what markets are calling a 'Black Friday' session, triggering sell sidercar halts and foreign investor outflows of 5.7 trillion KRW
• South Korea's five major banking groups (KB, Shinhan, Hana, Woori, NH Nonghyup) posted a combined record H1 net profit of 13.1 trillion KRW, up 9.74% YoY, driven by non-interest fee income from the buoyant stock market earlier in the year
• The violent KOSPI correction — the 66th sell sidecar and 9th circuit-breaker this year — signals extreme volatility in Korean equities, with foreigners and institutions combining to sell 2.4 trillion KRW intraday

South Korea's equity markets suffered a severe 'Black Friday' session on July 24 as the KOSPI index plunged 5.72% (406 points) to close at 6,690, failing to hold the psychologically important 7,000 level. The KOSDAQ simultaneously fell more than 5%, triggering coordinated sell sidecars across both indices. Foreign investors led the liquidation, selling 5.7 trillion KRW (approximately US$4.1 billion) in a single session — one of the largest daily foreign outflows on record. The sell-off comes against a backdrop of elevated geopolitical risk (Middle East conflict, rising oil prices) and a global bond market repricing, suggesting this is part of a broader risk-off repositioning rather than a Korea-specific catalyst. The Newsis and Dong-A Ilbo report that this year has now seen 66 sell sidecars and 9 circuit-breakers — an extreme frequency suggesting systemic volatility rather than isolated events.

The juxtaposition with the banking sector data is stark: South Korea's five largest banking groups (KB, Shinhan, Hana, Woori, NH Nonghuop) collectively posted a record 13.1 trillion KRW in H1 net profit, up 9.74% YoY, driven by a surge in non-interest fee income from brokerage commissions and investment banking revenues during the earlier bull phase. The profit record was built when KOSPI was above 7,000 — the same levels now breaking down. This divergence is a characteristic late-cycle signal: financial sector profits peak on market-derived fee income just before the equity market corrects. The market's ability to sustain further declines is now a function of whether domestic retail investors, who were significant buyers during the bull run, begin forced selling.

Forward signals center on whether foreign investor outflows persist beyond a single session or represent a position rebalancing event. Five consecutive weeks of sell sidecars indicate structurally elevated volatility — any sustained oil shock or geopolitical escalation will keep risk appetite suppressed. The Bank of Korea's next rate decision and any emergency market stabilisation measures from the Korean Financial Services Commission are the institutional responses to watch. For India-based investors tracking Korean equity ETFs and the MSCI EM index, a sustained KOSPI decline would reduce the index's Korea weighting and potentially redirect passive flows to India and Taiwan as alternatives.

Synthesized from 8 sources.